2015661471 has 4 divisors (see below), whose sum is σ = 2687548632. Its totient is φ = 1343774312.

The previous prime is 2015661451. The next prime is 2015661481. The reversal of 2015661471 is 1741665102.

2015661471 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2015661471 - 2⁶ = 2015661407 is a prime.

It is a super-3 number, since 3×2015661471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015661451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335943576 + ... + 335943581.

It is an arithmetic number, because the mean of its divisors is an integer number (671887158).

Almost surely, 2^2015661471 is an apocalyptic number.

2015661471 is a deficient number, since it is larger than the sum of its proper divisors (671887161).

2015661471 is an equidigital number, since it uses as much as digits as its factorization.

2015661471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671887160.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 2015661471 is about 44896.1186629758. The cubic root of 2015661471 is about 1263.2012055565.

The spelling of 2015661471 in words is "two billion, fifteen million, six hundred sixty-one thousand, four hundred seventy-one".